Explain what the chroot command is and what it is used for in Linux and Unix systems.

The chroot command in Linux and Unix changes the root directory (/) for the current process and its children to the specified directory. This creates an isolated environment where the process only sees the contents of the new root.

It is used for:

• Creating isolated environments (e.g., for testing or system recovery).
• Limiting process access to the filesystem.
• Setting up a minimal environment for running applications.

Example:

sudo chroot /mnt/rescue /bin/bash

This will run bash with the filesystem root set to /mnt/rescue, isolating the process from the rest of the system.